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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b98e1ffd094e4989f4e86b889c77f794cd1d6e244cb2b7ee9571fb006cbaef6' 
  AND token = 'JdldpLDCE6HQTowGo5B0DVas7fhZLFhzz2lrJJCWsbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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