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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7950da5d9b8a4b39c695ffc95141cf8a100afe5ac34fa25479f9b2c55e08fc33' 
  AND token = 'MYeKxYKA/MtErxMkylpjf8C2eE/nAEZI8Tri3++3POA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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