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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8872c8afc3e53247d61330429484060c37db0650671f3dda3fbbfffea5046416' 
  AND token = 'lBxX5Lz44iQi2bO+9xCQ3eVZ+oRXyT7qkO114hX7mrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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