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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d34781f438774729487ab35c07ee686759f5770384c9127d16acd0113e94405' 
  AND token = 'tAPKI6DSoXF0E3U3ptgcpfBjlJNmAS4zhc422EEV7Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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