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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea79cce0ab0eadb22ca2bebdad183a2499877cf0c54818135c9c10574acdc5f2' 
  AND token = 'g6cAY5K62ljfD+dNW34H2stbWeBwJM4KPK5Rb7YfcFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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