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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9251d0ba32790c84cbda2adf268afedf7d59e6ec7fd39ec233b9a7c9092f1fac' 
  AND token = '53hv4x4vlm6ZpwmevcnTH9vm11h/nHarvWQrX9shQUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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