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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a2e7d1ac5094e5c3220f0837770410654d8bb4c3d11a34590d527e79270647' 
  AND token = 'NDEKYd5rczB4e4Vm0KfB2xnCdsZAG6H0kvvEGphWjX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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