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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fd7803d84aac7e0e34b51691805ae8f5c57e5bb60d352342deac007b8a60ef' 
  AND token = '4SSAqDtqAOehBfVkHOj+Qxp5ZScps/RCzepKiqO3WYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}