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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58d3d17b86d697560bc3ead862b1069d7da194f77bb0dd822289fc92d15f57c' 
  AND token = 'KHJXtcme5vepRCmU5nCN4SQDgumsmS2FERSrZVT9SzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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