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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d6e894998807fb62fc4bc981743dc25a09d744eba5d1cfd94aa647991e632f' 
  AND token = 'aUkmwX4qxS/GMkkNfoBWE/WPJTJAdeHNXJLT8cK5vvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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