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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c36143b42a255f164e721d5edd0cbf1a348ec101de47b2a88668c7d41d0cc67' 
  AND token = 'Fde6EoZdqfIb2giaBtMmkmRqXX9/5YG8sfxb/31siIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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