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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ad710255fb9a18f9c635ffcc189886a3c54e7b2aa6ae008d22a052697ae909' 
  AND token = 'W16dMTGnn/F74siNIJ9p5glVv2a8/7l6MmaeMw59MII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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