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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55a899d48c9d53de3e1f3a18706817635e4d2c15bbd86a37e93a938c3d5199e' 
  AND token = 'v1HfGXNaBAVhlmhsY8gNErOB7stpxq2JTHKJw03cRFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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