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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ab55643f958fe521a76d1888b94205db5baf9c1cb32b8d18a968e957e6b571' 
  AND token = 'BnVI8WtMynUM6cdY4kI114MShzSf4++ooASWHW21+Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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