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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc964704fcb81aa50f95b704cee193c89d635e68b9ed735a0690d5a2ac65398' 
  AND token = '7pM+u6IJK26pFei4bWwrbLqlf7oCEygBCTuAqnD52pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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