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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5030c54be923c1d1b1d3a8f591d23637a0b4485cc47e68be8822f37155039003' 
  AND token = 'jslkOpAsAVhTlPKRdGVcnjCSanOf4e3tgKTY7q3ndVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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