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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2356c676dd55d2c72893f37f5a9b5a8e18070d440ca075d742ddbf6320929692' 
  AND token = '+uKZSmn1raeWkJJ8yuNHhmBZGRedxB56f+idqMr8jmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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