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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a33544220e6ee0d739abe351cee79caa37d4a77de2907c2caaff3032af7754' 
  AND token = 'bH+oZ220+Ax/7UYrCJJInkd1NYZe9eWlqCSf0z3r+/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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