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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f2a87294af7df3eb81365140628fdbb130b029a20279c6eb1e0c2e92076273' 
  AND token = 'uFuod/Dc4Fy7LecSetS28+lZUu5Za6EQD7tpxKVxcEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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