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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994ff30a648af1caf87bd05ecc262be1d8fcf3619e6cc62d8f9e026f9924d30d' 
  AND token = 'YZDBp7pQhXVh7bIrbP6mcFotu8yUxLCTNOgbU6CrLCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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