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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9da52b36649f6f6f9f1dccf151ce8c65d0b0c8b06e58b4188ff688dfaf2473' 
  AND token = 'AP3J/0RD6O0fPAPuMTAjxHmn9JWHcxouugn9gDInTnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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