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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15562896e54c564c3d26c8c4d8ad2a8b8690f86e7e62bc63ac44e0da2ef9e4c' 
  AND token = '3aotEeqxoTYAnZ5wYlRgFUas2hFbMez11XopyRJsi/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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