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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da06a760632d3ebc417071a2752269302f2c22645a3d335f619cc995404c6888' 
  AND token = 'EXEX6S4ksSMqvC3MikCzDiYhx37J3nTtdk9w1mm8pLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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