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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3986a6faa1253c1131b9d118dc0b7ab9e21e5d7567cc8a9c205f0feca42b845e' 
  AND token = 's66813I3VxJP6fWY6hLp8IGJP9IpeRnP6p8iDWgef+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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