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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78512899b47daa05c44250ad1a9ddecab9e43ac8649bcb805e216dc289e7e9cf' 
  AND token = 'hw7Urmf4rBZis0J467Ui+dF66fQOSaj8+xUjjFiQhvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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