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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0feba12a472bb0cb9b10883a1ddd200d5b8cbcac54cc6bf5b1c7467e0561922f' 
  AND token = 'Yi2Y+nj4BVuTgm8RUy1oK8IHkaNam/pufWuzLO+JCNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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