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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210abca92ed17b0c4dcddd9828caeb63a67acb98f7007abe5f330cb9d990146f' 
  AND token = '30axaokPWgCJEo+CILlK7NdE+tmkquHNvDrOoZXRrUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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