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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b3a7689301d7bcb77fcef48f22d94cbd670915e969eb0f2e22aacbe3929c2b' 
  AND token = 'k0YoG+io4a0Q/vxrpt2l+z58JKjBO6da2sKcrHMDSaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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