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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a6dca1113e29fded1be9a1b084d871e2f0632d058ef4cee80a66ac749df2a3' 
  AND token = 'Qp7SE4CSZWELJ4X038uLW7aCaSko1F8lBI+eJhoLOFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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