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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fb6cc62233dd32c00a2b1b99ec6482cf2d2527de8cecd865b8444c585950e3' 
  AND token = '1jya+9QkUmR2kJMm5x/FAbruc2oBvJtZug9SuFtff9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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