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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396a844eb7acd8d14aa29e4e7a51e8b5bab968ad8486ce359f7dbb9346f1e0b5' 
  AND token = 'usKplL4Y3BDeeO6ben74NHFj1UwopBO1papRxn+gl/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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