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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9eae48203da160dff5e0ad0c9911f64fe7565bc105c4ca53e9e2be69486fa2a' 
  AND token = 'yYNERjmX6Imrc5cCNiWko3Xr8n03Dt1n4O3+jmFTljk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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