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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258a9463dd42876c0f17cd75088458f979bed677597684bd113e96fdcab51b8f' 
  AND token = 'fBSZ6SwxhJtN2fPFYDNc8agXDxbFzxF7xHl6Cepd6KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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