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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0582ef8fb820a4e465c3ba645eb25e262514b17f8236a908ca916b393af134' 
  AND token = 'PlpstyqdvDmxsW3vPh5ci3/9b584sLCmOXOx/rw7fsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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