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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cda14497807f5f6ba7aaf3b8ca60ff83b914a9e8c4293fb9bf98fce108d485' 
  AND token = 'ygYjkCQVYoifhpXE5Xt6sad6llRFH+luKwOM+/RkCyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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