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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788bc57d71a9ba752d624a5f03589522bf3e0795a68e960b632c58ddfc5f6f39' 
  AND token = 'TTkNkdSZRJBhh6j1Nbl1BpkqRoW/5eDq99AX8HDSSH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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