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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7fb39f53319d872b0bb1d9424377eb735720e99b752f2fed3a63aabaf8ea7a' 
  AND token = 'MVdCZgY3B0LFL+jULBClM8eRPu9vhuazC7EG3g7G8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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