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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f86a5c450398457adcc6dda6309eab9d4cfcc0847c7044d0e9ba7107461b90a' 
  AND token = 'VqhqnYQevp8BhhIqiNEfE0ch9a+EnNJLJh9s4gCcU1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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