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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfb3f2242391a83b5ce22ece1ccf8daf63d527af780b743d8dac0835985e3f7' 
  AND token = 'ouWW1HUUfFc5o684bzPBdn8pq581OALXfLDttRsKHSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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