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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507cb0358444b8d4f51d1a7678acd77bf87d855f98e149194a85fe5448f5719b' 
  AND token = 'Lc70Jt+LPYIJ1BrefhoI92j8DLLxCVW8bN+/XVVlQEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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