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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9ca5ceab416b128334bca86115d10efd629e0e3f76d613f6210a94272a47e1' 
  AND token = 'ffRSKhpzC5MFRwVKNZsRyG3m1/y+lT4vqmcK19CL598=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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