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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205b96d3668c4c1f2b8fee76a44936055926af7a2845eb2215875d3318637070' 
  AND token = 'dI12BOFcAtUYprfY9isL27+dIaAE7ia0OMasHJmm+SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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