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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea47b7cad58737975c1c2447d43eeae119a56bab511f23c54c68ea68d7a1149' 
  AND token = 'OhD/m3T0b3h4H5/sCNRUmr18ch72ebCO+cVJSCfgMFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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