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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a90e614c28cc4502e81e84eadc9636e7df0c748d9522f0aefdbc8324c39658' 
  AND token = '1BylppdkaAlNi8Yi3v/9hW8Ptksq1pfLsYDf0w8+e3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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