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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba17e801213d408497d6389a14ab1fbc9a443486840197db562aa45b7c4c5684' 
  AND token = 'R86mBjYR/ZGopC210PE4Fyfd8Wu2w0Bx8MCP+MJ80iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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