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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a11f9b06f600502ff4697c9d5a96b55d0d3d45fb6f0aa184a1cc464d4d33d41' 
  AND token = 'huPbadZYqGtn2/ZAkBRNhbQSZe/uIoWdznJYh1xQOgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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