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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a0a822f287436b0de563fa6a08a64c3f0a4c7858d9815ef876c4c2e328eefd' 
  AND token = 't2mv3dcPi/FvUdIEuNcMYRKMa0CvrC1aePi8sQP//OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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