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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ca0db27b39cbcfbaca75937b00070404cc8e68025b7017c545a4737648304c' 
  AND token = 'mT/3+rILJzg6oMzok6m9VsWLtNc0jX9XcXDvMYvjfKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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