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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b97992493a4c6cf26c8a8ab1231f3772957155a51c5677b332bc91680d04f98' 
  AND token = 'XRE3f+TxTCc6+8hnmk43ETK8Xl1azQU1fUDcHKojAsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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