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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cb3d8a5e4c0878ebe4aefa892cfd3f362da175f923a808ad83564ab4cf5a84' 
  AND token = 'x38jUpfeInG3bWQ3zLepAM5ErCf2uzbhIGxuP0HEo6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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