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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7788b6f875f95daab1d5c0f6813846b964ab0a2a17e95bad6458cd291e40be06' 
  AND token = 'v5txIS3hHM8c6w30p926uPOnJCCmqnVYoOhU5pdezwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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