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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ae9adfad1ed9caf72094ebf59620c2d3b2db893fbdabb76336b7997d07db0d' 
  AND token = 'Cx7L18vprcwT4Ea8HUv51qTRsROcd/1Cc/LZz3VKChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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