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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccf9011ea0c7bbf50c40e4f4d61df8de14fce1ef6ceb35156d211fdaab312ed' 
  AND token = 'iF5SU0lVaUjVAvQ8niYJ/aXOOc+jnP+LMvZ2KUQ2yeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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