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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853fbb2e5b478e40597ff643b59b1e301b09e044e1f036fbf1e205d3a3d25f40' 
  AND token = '59/ezKgdKXPfyWtFR19gJUuj96QM7k1Jv0qPsm8pJQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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