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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a083a5e1b1244c8758bc10a044f59ab3548db0641a4f8da232afc0142adc8b47' 
  AND token = 'REyS2psHkNA7IJqYeYvt/CfYZX0Gnu54TuBsLJKWn54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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