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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954bac13f0b8f34f25c8069250a00d2d4945993d9ade19a6ba7f6644db5fac40' 
  AND token = '/lfNA6tOh9XnkZb2qIeVkcgPONAuEKL4nVo5xuosjf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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