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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ffdc8b7a656afddb0281b95f14f0d206fd13b343df9221d3c20a4dbf349b55' 
  AND token = '0wradyI1CnHSdgNv41oNKNb1V+yRvai+ydQwPT0wgTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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