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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428cfe3c6a24eca2b527c4d0696de0ed15cc5bd1e2f09b142a9ae7b7f5cf06d3' 
  AND token = 'ANtc8YNFwz7jKwPt4ew/OYDXHiaCKlpLu7jNRzoBeXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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